64528domain: NAppears in sequencesa(n) = 3*a(n-1) + 4*a(n-2) - a(n-3) + 3*a(n-4) + 4*a(n-5).at n=11A135450Number of 4-power-free binary words of length n.at n=18A273154Number of nesting labeled digraphs with vertices {1..n}.at n=4A326209a(n) = sum_of_digits(a(n-1)^a(n-2)) where a(1)=1 and a(2)=2.at n=13A338917